Анимация печатания текста в TextView

public class DelayedPrinter {
 
    public static void printText(final Word word, final TextView textView) {
        Random random = new Random(System.currentTimeMillis());
 
        int currentRandOffset = random.nextInt(word.offset);
        boolean addOrSubtract = random.nextBoolean();
        long finalDelay = addOrSubtract ? word.delayBetweenSymbols + currentRandOffset : word.delayBetweenSymbols - currentRandOffset;
        if (finalDelay < 0) finalDelay = 0;
 
        textView.postDelayed(new Runnable() {
            @Override
            public void run() {
                String charAt = String.valueOf(word.word.charAt(word.currentCharacterIndex));
                ++word.currentCharacterIndex;
                textView.setText(textView.getText() + charAt);
                if (word.currentCharacterIndex >= word.word.length()) return;
                printText(word, textView);
            }
        }, finalDelay);
    }
 
 
    public static class Word {
 
        private long delayBetweenSymbols;
        private String word;
        private int offset;
        private int currentCharacterIndex;
 
        public Word(long delayBetweenSymbols, String word) {
            if (delayBetweenSymbols < 0) throw new IllegalArgumentException("Delay can't be < 0");
            this.delayBetweenSymbols = delayBetweenSymbols;
            this.word = word;
        }
 
        public void setOffset(int offset) {
            this.offset = offset;
        }
    }
 
}

DelayedPrinter.Word word = new DelayedPrinter.Word(100, "Hello, word");
        word.setOffset(50);
        DelayedPrinter.printText(word, textView);